After undertaking a full and proper study, the Commission for Historical and Architectural Preservation may propose as a Historical and Architectural Preservation District or as a Historical Conservation District any area in Baltimore City within which are located structures that have historical or architectural value, the preservation of which is considered to be for the educational, cultural, economic, and general welfare of the public. For a Historical Conservation District, the study shall include consideration of those alterations in which CHAP has design review authority pursuant to City Code <cite data-path="|6|8">Article 6, Subtitle 8 {“Alterations, etc., to or Affecting Properties”}</cite>. City Code, 1976/83, art. 1, §40(j)(1) 2000, art. 6, §3-1(a) Ord. 64-229 Ord. 67-939 Ord. 76-022 Ord. 99-547 Ord. 07-550 Ord. 15-408